Visually stimulating. Catchy opening sequence with an equally upbeat theme song...really puts you in the mood for an adventure. Very fun characters. Doesn't take itself too seriously, though at least two of the episodes I've seen were rather somber if not sad at times. You never know what you're going to get. Dandy is just a typical testosterone-laced, over-sexed but under-serviced young man. The cat guy seems to have about six ears...or maybe it's just his hat. The little robot has a girlish voice that squeaks; she is usually the voice of reason.
I've read a few people who bash this as a sub-par "Cowboy Bebop" ripoff. I wouldn't know, since I don't watch much anime.
But I do know if you're in the mood for something that's funny, visually energizing, and a bit thoughtful at times, there are worse things you could do with the 30 minutes you'll spend watching an episode.
Not sure how long it will last, but I am looking forward to more seasons.
Fingers crossed.